Upgrading the js client

Upgrading the deepstream js/node client to V5

The one breaking change in the V5 client library is the following:

import { DeepstreamClient } from '@deepstream/client'
const client = new DeepstreamClient('localhost:6020/deepstream')

as opposed to how it was done before:

import * as deepstream from '@deepstream/client'
const client = deepstream('localhost:6020/deepstream')

This provides much better typescript support and stops us from trying to do high level wizardry when creating the bundle